Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f78a3ceb85e6108…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 21:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0562117a468945ab0e8da694ad5be18a SHA-1: 8f3a99be248ce03a09a5df3645859aa942d23d50 SHA-256: 4f78a3ceb85e6108e6306695ab56e31e78c3dbc3e69789347ae0321034b28c45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to compromised websites and link farms, suggesting an intent to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=principal+agent+problem+in+economics+pdf PDF link annotation
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160910a1371564---391928473.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/95ea796b4be63025e92ddefc77230c35/93697612335.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/vajavarirofikuvukuw.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/7e7ab4455e6406399e7504546a1bc47c/94219788813.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/xedakotaginugigegelif.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd5b58c5ad---vavupuromurifilinekadilus.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/61330730661.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/nomuxokedu.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/40983768926.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/59445836024.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/396af5aba467f66ae0c097a1c9d41210/mavakaranulef.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/nenapulanu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/94379673040.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/59950495476.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16104b971b97c3---17014328780.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/mufawekiwuva.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/wukuwopatewemumunopetomo.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/juvupofafexazezoxor.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/31285452387.pdfIn PDF document text
    • http://www.pvvc.cz/files/45797132809.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/59459125976.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/37603010104.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 17320 bytes
SHA-256: b3af6a7eb8c54763742c20a2e1005a45141dc33337a21cc9d94aaa80c239ffa0
font_02_sfnt_off000117e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 11104 bytes
SHA-256: 82c0b9cd78b106d06c7826b63a1f72e0178dd4f67ed54313a4fe4d218841011a

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